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United Nations conference on desertification, 29 August - 9 September 1977, [Nairobi] : round-up, plan of action and resolutions / Centre for economic and social information.
- UN,
- [ca. 1978].
- New York :
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Report of the United Nations conference on science and technology for development, Vienna (20-31 August 1979)
- UN,
- 1979.
- New York :